The process of converting features on a map or image (either hardcopy or digital) to vector-based data in digital format.

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10 views

Troubleshoot with “Split selected features with selected line from another layer”

I am trying to use the "Split selected features with selected line from another layer" tool from the plugin Digitizing Tools in QGIS. Sometimes, this tool works with my shapefiles but sometimes it ...
13
votes
3answers
10k views

How to create polygons with straight lines and right angles in QGIS?

I am running QGIS 1.7.0 on Mac OS X 10.6.8. When creating a polygon, how do I do it so that the lines are straight (90, 0 degrees, etc.) and when I create corners they can be right angles? For ...
2
votes
2answers
212 views

Suitable Raster processing methods to extract field boundaries from images

I'm trying to extract field boundaries and features from a lot of aerial images of agricultural land - and avoid digitizing these features manually. I've managed to get a crude raster file of the ...
2
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0answers
50 views

polygon/polyline digitizing techniques for geological data

My current work involves extensive digitising of historic geology data - essentially the creation of new polygons and polylines based on overlain raster and vector layers. This is all done manually ...
2
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0answers
28 views

Making perfect rectangle in QGIS [duplicate]

I want to be able to set the height and width of my rectangles, as well as the angles. I have been trying the Rectangles Ovals Digitizing plugin, but I can't seem to make it do anything (besides turn ...
1
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2answers
72 views

How to Continue a Line Feature in QGIS?

I'm looking for a way to continue a line feature in QGIS. I have checked the Digitizing Tools plugin (both regular and advanced) for a Prolong Line tool, but I haven't had luck. In ArcGIS there's a ...
2
votes
1answer
877 views

“Node tool: could not snap to a segment on the current layer” message

I have a strange issue. Editing a layer with node tool I get always the following message: "Node tool: could not snap to a segment on the current layer." This error happens to me even with a fresh ...
0
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1answer
197 views

How to change the QGIS edit cursor and node icons?

Two things I really dislike at QGIS, are the "fat" node icons (when editing lines) and the cursor which cover the object below and make it impossible to accurately move a node. Is it possible to ...
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1answer
245 views

How to suppress advanced digitizing tool window

I'm using QGis for years but suddenly I stuck with something that I'm sure it's an easy fix. Every time I start to create a new feature, the Advanced Digitizing tool window pops up. Do you know how to ...
6
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2answers
1k views

How to digitize building footprints with orthogonal edges?

Using QGIS, I am trying to digitize an old raster map, and because I ultimately want to load these 2d layers into sketch-up to turn into 3D models, I need everything to be square. Here's a sample of ...
5
votes
2answers
8k views

Showing polyline direction in ArcGIS for Desktop (ArcMap)?

How can I show the direction of a polyline as it was digitised? I need this to check if my network analysis is obeying one way streets. I know of a tool in Xtools that can do this but my trial ...
1
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0answers
12 views

QGIS - snapping points onto lines [duplicate]

I have two layers, one is point layer and other one is a line layer. I want the point features to snap on to the lines, but the points are away from the lines. Is there any way to move the points onto ...
1
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0answers
37 views

Creating sub-polygons based on underlying basemap?

I'm looking at ranging patterns where animals go in and out of nature reserves into residential areas. In addition to home range polygons, I've generated polygons made from applying 25m and 50m ...
1
vote
1answer
38 views

Possible to set default attribute fields for vector creation?

I'm using the latest release of QGIS (2.14). Is it possible to set default attribute field parameters to be used automatically during the creation of new shapefiles/vector files? I'd be specifically ...
2
votes
1answer
52 views

Digitizing jpeg image or georeferencing it first?

I'm a new learner when it comes to QGIS. I have a jpeg image and I want to convert it into a shapefile. The problem is when I polygnized it, the resulting image is inverted. So i decided to just ...
2
votes
3answers
82 views

Digitizing Tools error in QGIS

I receive this message: Digitizing Tools: Amend Line is disabled because layer CRS and project CRS do not match. If I set the CRS of the layer the same as the project CRS (W84 Pseudo Mercator) is ...
8
votes
2answers
208 views

Automatic numbering of points during digitization in QGIS?

Does somebody know how to automatically number the points during digitization in Qgis. To explain, when I create the new point there is the window where I must to type the point number. Is there any ...
3
votes
3answers
90 views

In transferring a family cemetery layout to a digital format, I need a software program [closed]

We have a large historic family cemetery. I've had surveying experience, drafting in the days when it was done by hand, and a lot of real estate experience with deed descriptions and layouts on maps. ...
4
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0answers
266 views

How to digitize in stream mode in QGIS, using a tablet?

How to digitize in stream mode in Qgis, using a wacom cintiq tablet? freehand it's no use. i need something like MNDR stream digitizing extension for arcview 3.x, which allows continuous tracing, ...
2
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0answers
68 views

Geometry issues when digitising in QGIS

I'm digitising a large number of maps from hand drawn mud maps and digital images, and although I have used the snapping tools ("snap to vertex and segment", Tolerance 10 pixels, avoid intersections) ...
4
votes
2answers
115 views

How to automate 'downstream' and 'upstream' manhole ID field in a pipe line feature

I have been digitizing a drainage network and now have been supplied attribute fields to add to the features I have digitized. Two of the fields for the pipe features are 'upstream manhole ID' and '...
0
votes
1answer
16 views

Resources for digitizing in webmap and export? [closed]

Its possible with Google Map API to draw geometries and points. And exporting as well I assume. Is there other alternatives, probably based on Java that can do the same job? I've been researching on ...
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2answers
61 views

Is it possible to find the minimum map-able unit (MMU) after creating a map?

I'm not very good with the GIS lingo so I apologise if this doesn't make too much sense! Lets say I have just finished digitising the land cover of an aerial photograph and it's looking like the ...
8
votes
4answers
7k views

How to digitize a raster automatically

I have a raster (.sid extension) file. I want to digitize roads automatically in ArcMap, QGIS..etc. Digitizing by hand would be too time consuming. How can i do this ? Thanks
3
votes
2answers
101 views

Changing QGIS cursor size and color?

I'm digitizing some old topographic maps (scanned images), and these maps are in grayscale. When in editing mode, to draw the contour lines, I would like to be able to change the color and size of ...
1
vote
1answer
137 views

Steps to digitize OpenStreetMap in QGIS?

I am new to QGIS. Can someone help me with the steps to digitize OpenStreetMap? Or should I save the particular area I want to digitize into .tiff files and then try to digitize the .tiff file?
1
vote
1answer
27 views

Digitizing 2-node lines?

I tried digitizing in to a new sqlite line layer with autoincrement id ticked..... I want to create a 2-node line, but there seems to be a minimum limit of 3 nodes. Is this correct or am I doing ...
6
votes
5answers
2k views

How to Digitize Free Satellite Imagery in QGIS - Alignment issues with Openlayers Plugin

I am trying to digitize OpenLayers data (such as Google satellite imagery) with no success. Whenever I try to move or zoom the canvas the vector layer I digitized loses the position relative to the ...
3
votes
1answer
54 views

Change direction of polylines from DEM data

I am trying to define the direction of my polylines (which represent gutters in a drainage system). Does anyone know if it is possible to define the direction based on elevation data extracted from a ...
2
votes
1answer
310 views

Newly added points disappearing after saving edits in QGIS.

I am adding features to a shapefile point layer in QGIS 2.12 Lyon. When I add the new point I can see it, but once I click the Save Edits button it disappears. When I click Toggle Editing button to ...
3
votes
4answers
3k views

Looking for an efficient way of digitizing building footprints using orthophotos and ArcGIS 10

In the past I've used PCI Geomatica to do something similar using the softwares classification functionality. Are there some tools/tricks in ArcGIS that will partially automate the process. I remember ...
5
votes
1answer
135 views

How to split a polygon into multiples sections in QGIS?

I am working on QGIS latest version 2.12.3. I am digitizing a polygon. It represents a riparian buffer of a river. The polygon made a continuous « loop » with a widht of 50 meters. I want to split my ...
2
votes
2answers
91 views

Drawing a polygon of a given area

First, I am using QGIS 2.8.2. I have GPS waypoints and satellite imagery and am trying to draw polygons. This is easy enough, but I need to make sure each polygon is 1ha exactly. Is there a way to ...
2
votes
1answer
67 views

Can't Find the Split selected features with selected line from another layer tool

I'm trying to split a selected polygon features with a selected line from another feature layer. I, however, can't seem to get the tool for this to show up in my advanced digitize toolbar. In ...
1
vote
0answers
63 views

salt marsh recession mapping with landsat/WV, IKONOS) [closed]

I am trying to detect timing and pattern of change in a particular salt marsh (low marsh sitting close to a high marsh). Basically, I'm interested in detecting changes in the leading edge for ...
4
votes
2answers
241 views

How to create in QGIS shapefile a field that automatically returns the current date

I'm digitizing a shapefile in QGIS and I need to create a field that returns automatically the current date.
3
votes
1answer
303 views

Keeping streaming on in ArcMap when switching editing tools?

I have this problem constantly, because I digitize for work. No one there has figured this out and I was wondering if someone can tell me how to do this, because I'm tired of constantly hitting F8 and ...
5
votes
4answers
1k views

Editing with auxiliary features (lines, points etc.) in ArcGIS Desktop?

In order to digitize exact features in ArcGIS Desktop 9.3.1, our draftsman would like to use auxiliary features (lines and points mostly) that don't have to be saved later on. I told them the easiest ...
3
votes
0answers
49 views

Digitized points are getting displaced automatically in QGIS

We are capturing 100's of drilling sample locations in QGIS. At times, we are copying the whole set of points from adjacent survey_lines to the next one. After that, we will capture the respective ...
2
votes
1answer
26 views

Automatic selection of colored regions when digitzing choropleth maps

I am new to working with GIS. I have a raster choropleth map similar to the one displayed below. I want to create a shapefile from the map, where each layer contains all the countries that have the ...
0
votes
0answers
74 views

Digitizing scale when digitizing from Bing imagery service in QGIS

I need to digitize a bunch of islands from imagery in QGIS. It is the Bing Maps aerial imagery layer. I will obtain all required permissions. My plan is to lock the map scale at 1:25,000 and use heads ...
1
vote
3answers
1k views

Auto populating XY fields when new point feature digitized using ArcGIS Desktop?

Is there a way for ArcGIS Desktop to populate a field automatically when a new point is dropped on the map? We have our map in State Plane Feet, and we want to the database to automatically add WGS ...
-1
votes
1answer
68 views

How are digital maps generated? [closed]

This is a more of a noob GIS question. How are all the features on the maps we come use know and love (Google Maps, Bing Maps) generated from imagery? Does somebody actually look at the imagery and ...
2
votes
2answers
154 views

Conditional Value Map widget in QGIS

I am looking for a way to implement conditional value mapping in QGIS. This means that the values available in attribute number 2 depend on the value provided in attribute 1. Example: If the user ...
1
vote
1answer
79 views

Connecting vertices to form a line without using an attribute

I have a number of multipoint features that form lines (hiking trails). I would like to connect the dots of each multipoint feature to generate line features, but there are no attributes with which to ...
1
vote
1answer
103 views

Digitized Map To Scale

Is it perfectly acceptable to produce a map at a scale of 1:24,000 from a database that was digitized from a 1:100,000 scale source map?
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0answers
64 views

Is it possible to trace basemap features?

I'm looking for an easier way to digitize. Does anyone know if it's possible to trace basemap features (OSM/stamen/etc) in QGIS (2.12)? For example, as opposed to creating various vertexes along a ...
4
votes
0answers
251 views

“Error” on Advanced Digitizing Window in QGIS

I have the word "Error" that has appeared on my Advanced Digitizing Panel since upgrading to QGIS 2.12.0 Lyon. It doesn't appear to actually affect anything negatively... has anyone else seen this or ...
2
votes
0answers
88 views

How to avoid topology errors when digitizing a road network?

I am working on a road layer project. For the snapping option I'm using the mode to vertex and segment and tolerance 5 pixels. When zooming in (to the max) I do not notice a gap. But when I use the ...
0
votes
1answer
49 views

Niche MapInfo Question : Digitising options

I've recently started using mapinfo to digitise on a daily basis, I am usually georefencing old deeds (on top of OS Mastermap) and then digitising them. The problem is when drawing the polygon the ...